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4 Cards in this Set
- Front
- Back
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What is a nucleus of an atom made up of?
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protons and neutrons
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Why is an atom neutrally charged?
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the atom has the same amount of positively charged protons and the same amount of negatively charged electrons
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What is the atomic (proton) number?
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the number of protons inside the nucleus of the atom
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What is the mass number?
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the number of protons and neutrons inside the nucleus of the atom
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